ZyXEL Communications 3.1 User Manual

Chapter 19 L2TP VPN

ZyWALL (ZLD) CLI Reference Guide

This example uses the following settings in creating a basic L2TP VPN tunnel. See the Web 
Configurator User’s Guide for how to configure L2TP in remote user computers using Windows XP 
and Windows 2000. 

L2TP VPN Example

• The ZyWALL has a static IP address of 172.23.37.205 for the ge3 interface. 
• The remote user has a dynamic public IP address and connects through the Internet. 

certificate cert_name 

Select the certificate to use to identify the ZyWALL for L2TP VPN connections. The 
certificate is used with the EAP, PEAP, and MSCHAPv2 authentication protocols. The 
certificate must already be configured.

[no] l2tp-over-ipsec user 

user_name

Specifies the user or user group that can use the L2TP VPN tunnel. If you do not 
configure this, any user with a valid account and password on the ZyWALL to log in.  
The no command removes the user name setting.

[no] l2tp-over-ipsec keepalive-

timer <1..180>

The ZyWALL sends a Hello message after waiting this long without receiving any 
traffic from the remote user. The ZyWALL disconnects the VPN tunnel if the remote 
user does not respond. The no command returns the default setting.

[no] l2tp-over-ipsec first-dns-

server {ip | interface_name} 

{1st-dns|2nd-dns|3rd-dns}| 

{ppp_interface|aux}{1st-dns|2nd-

dns}}

Specifies the first DNS server IP address to assign to the remote users. You can 
specify a static IP address, or a DNS server that an interface received from its 
DHCP server. The no command removes the setting.

[no] l2tp-over-ipsec second-dns-

server {ip | interface_name} 

{1st-dns|2nd-dns|3rd-dns}| 

{ppp_interface|aux}{1st-dns|2nd-

dns}}

Specifies the second DNS server IP address to assign to the remote users. You can 
specify a static IP address, or a DNS server that an interface received from its 
DHCP server. The no command removes the setting.

[no] l2tp-over-ipsec first-wins-

server ip

Specifies the first WINS server IP address to assign to the remote users. The no 
command removes the setting.

[no] l2tp-over-ipsec second-

wins-server ip

Specifies the second WINS server IP address to assign to the remote users. The no 
command removes the setting. 

no l2tp-over-ipsec session 

tunnel-id <0..65535>

Deletes the specified L2TP VPN tunnel.

show l2tp-over-ipsec

Displays the L2TP VPN settings.

show l2tp-over-ipsec session

Displays current L2TP VPN sessions.

L2TP VPN Commands